Werte können nicht aus der Firebase-Datenbank abgerufen werden

Question

Ich verwende den Firebase Recycler-Adapter von Firebaseui, um Werte aus Datenbanken anzuzeigen.
Hier ist mein Code Wert aus der Datenbank für Datenbank

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    mRef = FirebaseDatabase.getInstance().getReference(); 

    listRef =mRef.child("itemlist"); 


    recyclerView = (RecyclerView) findViewById(R.id.recyclerView); 
    recyclerViewLayoutManager = new LinearLayoutManager(this); 
    recyclerView.setHasFixedSize(false); 
    recyclerView.setLayoutManager(recyclerViewLayoutManager); 

    recyclerView.addOnItemTouchListener(
      new RecyclerItemClickListener(MainActivity.this, recyclerView, new RecyclerItemClickListener.OnItemClickListener() { 
       @Override 
       public void onItemClick(View childView, int position) { 
        Log.v(TAG,"YouClickon"+ position); 


       } 
      }){ 

      } 
    ); 
} 

@Override 
protected void onStart() { 
    super.onStart(); 

    attachRecyclerViewAdapter(); 

} 

@Override 
protected void onStop() { 
    super.onStop(); 

    if(mRecyclerViewAdapter != null){ 
     mRecyclerViewAdapter.cleanup(); 
    } 
} 

private void attachRecyclerViewAdapter() { 

    mRecyclerViewAdapter = new FirebaseRecyclerAdapter<ItemList, ItemHolder>(
      ItemList.class, 
      R.layout.shop_recycler_row_view, 
      ItemHolder.class, 
      listRef 
    ) { 
     @Override 
     protected void populateViewHolder(ItemHolder itemHolder, ItemList item, int i) { 
      itemHolder.setName(item.getName()); 
      itemHolder.setDescription(item.getDescription()); 
     } 
    }; 

    recyclerView.setAdapter(mRecyclerViewAdapter); 
} 


public static class ItemHolder extends RecyclerView.ViewHolder{ 
    View mView; 

    public ItemHolder(View itemView) { 
     super(itemView); 
     mView = itemView; 
    } 

    public void setName(String name){ 
     TextView field = (TextView) mView.findViewById(R.id.tv_shopName); 
     field.setText(name); 
    } 

    public void setDescription(String text) { 
     TextView field = (TextView) mView.findViewById(R.id.tv_shopDesc); 
     field.setText(text); 
    } 



} 

Die json Struktur zu holen, wie unten angegeben:

{ 
"itemlist" : { 
"-KJ5USfIBXgAfpurhHjE" : { 
    "-KJ5Uf0XkahJ5fqio8kq" : { 
    "description" : "Minal", 
    "img_url" : "HIU", 
    "name" : "Milan ni item" 
    }, 
    "-KJ5Ul7ZT2oKuCLxOY78" : { 
    "description" : "nathi kevi😷😷", 
    "img_url" : "HIU", 
    "name" : "mari item" 
    } 
}, 
"-KJ5VJtTUQqKnHmuu1tY" : { 
    "-KJ5d7aggDnYKz65PMHa" : { 
    "description" : "whaajakakq", 
    "img_url" : "HIU", 
    "name" : "Sweet" 
    } 
} 
}, 
"shoplist" : { 
"-KJ5USfIBXgAfpurhHjE" : { 
    "description" : "Milan ne Maru mane aaje muki ne chalya gaya fir ek baar", 
    "img_url" : "https://firebasestorage.googleapis.com/v0/b/fooder-5eba6.appspot.com/o/shop_images%2Fimage%3A26208?alt=media&token=75228031-dccd-4c45-bfcf-abe634d58bc6", 
    "name" : "31st May 2016" 
}, 
"-KJ5Uy4ALcLcJhKH6o9U" : { 
    "description" : "shop bhavnagar", 
    "img_url" : "https://firebasestorage.googleapis.com/v0/b/fooder-5eba6.appspot.com/o/shop_images%2Fimage%3A26213?alt=media&token=7aa14525-0fc5-4c11-a8fb-a44ab121bcfa", 
    "name" : "Daas" 
}, 
"-KJ5VJtTUQqKnHmuu1tY" : { 
    "description" : "dukaan", 
    "img_url" : "https://firebasestorage.googleapis.com/v0/b/fooder-5eba6.appspot.com/o/shop_images%2Fimage%3A26203?alt=media&token=748363be-f0ab-45b4-bd7d-f58be2308b6c", 
    "name" : "offline" 
    } 
    } 
} 

Jetzt möchte ich Werte von itemlist zeigen. Wie kann ich es tun?.

Answer 1

immer retrive i Werte von Feuerbasis wie folgt

//GET DATA FROM FIREBASE INTO ARRAYLIST 
    fb_to_read.addValuesEventListener....{ 
     public void onDataChange(DataSnapshot result){ 
      List<String> lst = new ArrayList<String>(); // Result will be holded Here 
      for(DataSnapshot dsp : result.getChildren()){ 
       lst.add(String.valueOf(dsp.getKey())); //add result into array list 
      } 
      //NOW YOU HAVE ARRAYLIST WHICH HOLD RESULTS 
     for(String data:lst){ 
      Toast.make(context,data,Toast.LONG_LENGTH).show; 
      } 
     } 
}